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Chpter 19: Industrial Ecology and Environmental Chemistry Manahan, Stanley E. "INDUSTRIAL ECOLOGY AND ENVIRONMENTAL CHEMISTRY" Fundamentals of Environmental Chemistry Boca Raton: CRC Press LLC, 2001 19 INDUSTRIAL ECOLOGY AND ENVIRONMENTAL CHEMISTRY __________________________ 19.1 INTRODUCTION AND HISTORY At the beginning of Chapter 11, mention was made of the anthrosphere consisting of the things humans construct, use, and do in the environment. The anthrosphere constitutes a fifth sphere of the environment, along with the geosphere, hydrosphere, atmosphere, and biosphere. Any intelligent effort to maintain and enhance environmental quality must consider the anthrosphere along with these other four spheres. This chapter is devoted primarily to the anthrosphere. In so doing, it emphasizes the emerging science of industrial ecology, defined and explained below. Industrial ecology is an approach based upon systems engineering and ecolo- gical principles that integrates the production and consumption aspects of the design, production, use, and termination (decommissioning) of products and ser- vices in a manner that minimizes environmental impact while optimizing utilization of resources, energy, and capital. The practice of industrial ecology represents an environmentally acceptable, sustainable means of providing goods and services. It is closely tied with environmental chemistry, and the two sciences work synergistically with each other. Industrial ecology works within a system of industrial ecosystems, which mimic natural ecosystems. Natural ecosystems, usually driven by solar energy and photosynthesis, consist of an assembly of mutually interacting organisms and their environment, in which materials are interchanged in a largely cyclical manner. An ideal system of industrial ecology follows the flow of energy and materials through several levels, uses wastes from one part of the system as raw material for another part, and maximizes the efficiency of energy utilization. Whereas wastes, effluents, and products used to be regarded as leaving an industrial system at the point where a product or service was sold to a consumer, industrial ecology regards such materials as part of a larger system that must be considered until a complete cycle of manu- facture, use, and disposal is completed. From the discussion above and in the remainder of this book, it can be concluded © 2001 CRC Press LLC that industrial ecology is all about cyclization of materials. This approach is summarized in a statement attributed to Kumar Patel of the University of California at Los Angles, “The goal is cradle to reincarnation, since if one is practicing industrial ecology correctly there is no grave.” For the practice of industrial ecology to be as efficient as possible, cyclization of materials should occur at the highest possible level of material purity and stage of product development. As just one of many examples that could be cited, consider that it is much more efficient in terms of materials, energy, and monetary costs to bond a new rubber tread to a large, expensive tire used on heavy earth moving equipment than it is to try to separate the rubber from the tire and remold it into a new one. The basis of industrial ecology is provided by the phenomenon of industrial metabolism, which refers to the ways in which an industrial system handles materials and energy, extracting needed materials from sources such as ores, using energy to assemble materials in desired ways, and disassembling materials and components. In this respect, an industrial ecosystem operates in a manner analogous to biological organisms, which act on biomolecules to perform anabolism (synthesis) and catabolism (degradation). Just as occurs with biological systems, industrial enterprises can be assembled into industrial ecosystems. Such systems consist of a number (preferably large and diverse) of industrial enterprises acting synergistically and, for the most part, with each utilizing products and potential wastes from other members of the system. Such systems are best assembled through natural selection and, to a greater or lesser extent, such selection has occurred throughout the world. However, recognition of the existence and desirability of smoothly functioning industrial ecosystems can provide the basis for laws and regulations (or the repeal thereof) that give impetus to the establishment and efficient operation of such systems. The term sustainable development has been used to describe industrial develop- ment that can be sustained without environmental damage and to the benefit of all people. Clearly, if humankind is to survive with a reasonable standard of living, something like “sustainable development” must evolve in which use of nonrenewable resources is minimized insofar as possible, and the capability to produce renewable resources (for example, by promoting soil conservation to maintain the capacity to grow biomass) is enhanced. This will require significant behavioral changes, particu- larly in limiting population growth and curbing humankind’s appetite for increasing consumption of goods and energy. 19.2 INDUSTRIAL ECOSYSTEMS A group of firms that practice industrial ecology through a system of industrial metabolism that is efficient in the use of both materials and resources constitute a functional industrial ecosystem. Such a system can be defined as a regional cluster of industrial firms and other entities linked together in a manner that enables them to utilize byproducts, materials, and energy between various enterprises in a mutually advantageous manner. Figure 19.1 shows the main attributes of a functional industrial ecosystem, which, in the simplest sense, processes materials powered by a relatively abundant source of energy. Materials enter the system from a raw materials source and are put in a © 2001 CRC Press LLC usable form by a primary materials producer. From there the materials go into manufacturing goods for consumers. Associated with various sectors of the operation are waste processors that can take byproduct materials, upgrade them, and feed them back into the system. An efficient, functional transportation system is required for the system to work well, and good communications links must exist among the various sectors. A key material in the system is water, and it is often in limited supply in highly populated arid regions of the world. Transportation system Energy Communications Labor Waste processing Manufacturing Primary materials processor Consumers Water Raw materials source Figure 19.1 Major components required for an industrial system. When these components exist symbiotically, utilizing waste materials from one concern as feedstock for another, they compose a functioning industrial ecosystem. A successfully operating industrial ecosystem provides several benefits. Such a system reduces pollution. It results in high energy efficiency compared to systems of firms that are not linked and it reduces consumption of virgin materials because it maximizes materials recycle. Reduction of amounts of wastes is another advantage of a functional system of industrial ecology. Finally, a key measure of the success of a system of industrial ecology is increased market value of products relative to material and energy consumption. An industrial ecosystem can be set up using two basic complementary © 2001 CRC Press LLC approaches. Within an industry, emphasis may be placed upon product durability and amenability to repair and recycle, which are compatible with the practice of industrial ecology. Instead of selling products, a concern may emphasize leasing so that it can facilitate recycling. The second approach emphasizes interactions between concerns so that they operate in keeping with good practice of industrial ecology. This approach facilitates materials and energy flow, exchange, and recycle between various firms in the industrial ecosystem. An important aspect of an industrial ecosystem is the practice of a high degree of industrial symbiosis. Symbiotic relationships in natural biological systems occur when two often very dissimilar organisms live together in a mutually advantageous manner. Analogous symbiotic relationships in which firms utilize each other’s residual materials form the basis of relationships between firms in a functional industrial ecosystem. Examples of industrial symbiosis are cited in Section 19.14 in the discussion of the Kalundborg, Denmark, industrial ecosystem. A useful way to view an industrial ecosystem is geographically, often on the basis of a transportation network. An example is the Houston Ship Channel, which stretches for many kilometers and is bordered by a large number of petrochemical concerns that exist to mutual advantage through the exchange of materials and energy. The purification of natural gas by concerns located along the channel yields lower molecular mass hydrocarbons such as ethane and propane that can be used by other concerns, for example, in polymers manufacture. Sulfur removed from natural gas and petroleum can be used to manufacture sulfuric acid, which in turn is a key raw material for the manufacture of a number of other chemicals. 19.3 THE FIVE MAJOR COMPONENTS OF AN INDUSTRIAL ECOSYSTEM Industrial ecosystems can be broadly defined to include all types of production, processing, and consumption. These include, for example, agricultural production as well as purely industrial operations. It is useful to define five major components of an industrial ecosystem, as shown in Figure 19.2. These are (1) a primary materials producer, (2) a source
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